I Know Regular Expressions

This is the much-requested shirt based on Comic #208 It warns everyone that you are not to be trifled with, that you have the situation well in hand, and that you can fix everything with a long jumble of indecipherable characters. (The expression on the front between the slashes is restrictive, but don't be greedy*?) On the back there is a hacker hero swinging in to save the day.